Electric-arc lamp



(No Model.) 2 Sheets-Sheet 1. E. PIOKERING.

BLEGTEIG ARC LAMP.

m m m A unlit)... 6.000050! 0.0000il00500000000 IOOOODICQ I OIOOQ.UQIOQQIQOQOUQ O OO Nv PETERS. Pnolminm n hur. Washmglon. D. C.

(No Model.) 2 Sheets-Sheet 2'. E. PICKERING.

ELECTRIC ARC LAMP.

No. 806,517. Patented 0013.14, 1884.

WITNESSES: FgVENTOR ATTORNEYS.

ed rigidly on the shaft 13.

gitudinal sectional elevation of the globeto which a pawl, O, ispivoted,which rests on Uivirno Sra'rns rnsrr rrrcn.

E DVVARD PIOKEEING, OF' BROOKLYN,

NEW YORK, ASSIGNOR TO MAURICE -J. HART, OF NEW ORLEANS, LOUISIANA.

ELEGTRlC-ARG LAMP.

Application filed February 15, 1884. (No model.)

To all whom it may concern/.-

Be it known that I, EDWARD PIOKERING, of Brooklyn, in the county ofKings and State of New York, have invented a new and Improved ElectricLamp, of which the following is a full, clear, and exact description.

The object of my invention is to provide certain new and usefulimprovements in the devices for regulating the carbon sticks in electriclamps; also, to provide certain new and useful improvements forautomatically cutting out any lamp when desired, and also to provide anew and useful improvement for holding the globe on the lamp-frame.

The invention consists in the peculiar construction and arrangement ofparts, as hereinafter fully described, and pointed out in the claims.

Reference is to be had to the accompanying drawings, forming part ofthis specification, in which similar lettersof reference indicate corresponding parts in all the figures.

Figure 1 is a longitudinal sectional elevation of the box containing theregulating mechanism of the lamp, part of the said regulating mechanismbeing shown in elevation and part in section. Fig. 2 is a side view ofthe switch mechanism for automatically cutting out the lamp. Fig. 3 is asectional plan view of the lamp-regulating mechanism. Fig, 4 is alonholder.

same.

The upper carbon is secured to the lower end of a vertically-movablerod, A, suitably guided in the lampframe,'which rod is provided with arack, A. The said rack engages with a cog-wheel, B, mounted on a shaft,13, on which is loosely mounted a cog-wheel, C,

Fig. 5 is a sectional plan view of the the toothed edge of aratchet-wheel, O mount- The cog-wheel O engages with a cogwheel, D,mounted 011 the shaft D, carrying a toothed wheel, D, the teeth of whichengage with a pallet, E, secured on a shaft, E, on which a pendulum bar,F, is mounted, the said pendulum-bar having its lower end, F, forked.The shafts B D E are journaled in the side pieces of a U-shaped or otherframe, F, the sides of which are united by suitable cross-pieces, F Eachside bar of the frame F is provided at or near the middle the otherline-wire, k, is connected.

with a V-shaped notch, a, in the bottom edge, into which notches theknife-edges 7), formed 011 a transverse bar, (1, of the frame of thelamp, pass. From one end of the frame F an arm, G, projects, which isprovided with a longitudinal slot, G, through which a transverse pin, 9,passes, which unites two down wardly-projecting lugs of a cross-bar, H,on each end of which a magnet-core,H,is clamped, the upper ends of thecores H passing into the central longitudinal apertures of magnets J,and the lower ends of the said magnet-cores 11 passing into thelongitudinal central aper- 6 tures of magnets J, which are wound withfiner wire than the magnets J, and are in shunt-circuits of the magnetsJ. A screw, K, held in the bottom of the frame projects upward betweenthe shanks of the forked end F of the pendulum-bar F. A magnet, L, isheld on the side ofthe frame, and is wound with coarse wire Z and withfine wire Z. The part wound with the wire Z is in the main circuit whenthe lamp is cut out, and the part wound 7 5 with the fine wire I is in aderived circuit from the spools J.

On a plate, M, of insulating material the armature N of the magnet L ispivoted, and on the said plate M two metal contact-plates, 8 O and O,are held, which are separated from each other. A contact-spring, P,secured to the bottom edge of the metal plate 0, projects under thebottom edge of the metal plate 0', and a contact-spring, P, secured to abutton, Q, projects under the bottom edge of the plate 0 and over thefree edge of the contact-spring P. Aforked switch-lever, R, is pivotedabove the plates 0 and O in such a manner that the two prongs of thesaid lever can rest, respecto ively, on the said plates O and O. Themetal plate 0 is connected with the line-wire 7c, and the plate 0 isconnected with one end of the wire forming the coils of the magnets J bya wire, m. The other end of the wire, forming 5 the coils of the magnetsJ, is connected by a wire, or, with the plate O, to which plate O Theopposite ends of the wire Z of the magnet L are connected with the plateO and with the button Q, respectively.

To the lower ends of the side bars or rods, S, of the lamp-frame across-piece, S, is fast ened, which is provided with a central plate,

S, having a central aperture, s, through which the lower carbon passes,and with two or three quadrant-slots, t, the said slots terminating atthe diametrically-opposite ends in circular apertures w, and havingcountersunk circular recesses n at the opposite ends. The curved bottomrim of the globe T is held in an annular groove, 1), of a plate, I, byscrews 1. The said plate I is provided with two upwardlyproyectrng pins,IV, arranged diametrically opposlte each other, each pin being providedat 1ts upper end with a beveled head, V. The globe is held on the plateI, and if it is to be lastened to the frame of the lamp the plate I isheld in such a manner that the heads V of the screws XV can be passedthrough the apertures w at the ends of the slots i. After the said pinsIV have been passed through the apertures 20, the plate I is given aquarterturn, whereby the pins \V will pass to those ends of the slots 15provided with the countersunk recesses o. It, then, the plate I isreleased, it will move downward until the heads V of the pins \V rest inthe countersunk recesses r at the ends of the slots 1, thereby holdingthe globe on the lamp-fame. The mag netcores II are made hollow, andeach provi dcd with a longitudinal slot, and are filled with chips ofiron wire, whereby they are made more sensitive.

The operation of the lamp-rcgulating mechanism is as follows: If thetension of the current in the lamp is too great, the shuntunagnets Jwill be excited, and will draw the mag net-cores H downward, therebymoving the corresponding end of the frame F downward and the oppositeend upward. The weight of the upper-carbon holderA revolves the wheelBin the direction of the arrow a, and, bv means of the pawl G, the wheel0 is revolved in a like manner, an d revolves the wheel D in the direct1on of the arrow 1/. As the i'rame carrying the pendulum-bar F israised, the forked end F of the pendulumbar will be raised above thescrew K, thus permitting the said pendulumbarto swing. Thesaidpendulunrbar,in swinging, permits the ratchet-wheel D to revolve thedistance of one or more teeth, thus allowing the carbon-holder A todescend, the carbon points are brought together, the tension isdecreased, and the magnets J become excited and swing upward the frame Fwhereby the end carrying the pendulum-bar is lowered, whereby the pointof the screw K will pass in between the shanks of the forked end of thesaid pendul u1n-l ever, thus preventi ng the pendulum-lever fromrocking. If the pendulumlever cannot rock, it prevents the wheel D fromrevolving, and thereby locks the other wheels in place, and thus holdsthe carbons in place. If the points of the carbons are again consumed,the strength of the current in the derived circuit increases, and theabove operation is repeated. The screw K can be adjusted to act sooneror later on the fork F of the pendulum-rod F. If the resistance in thelamp is very great, for some reason or other,

the magnet L becomes excited and its armature N is attracted, and thespring 1? is pressed against the spring 1?, thereby cutting out thelamp, as the circuit will then be from the linewire through the plate 0,the springs I and P, the contact-button Q, the wire Z, the plate 0, andthe line-wire k. If the resistance is removed, the lamp will be'eut incircuit again, as then the armature N is released, the contact of thesprings I and I is broken, and the circuit will be as follows: from thelinewire is to the plate 0, the wire m, the coil J, the wire a, theplate 0, and the line-wire It. If it is desired to cut out any lamp andto keep it cut out, the switch-lever It is turned in such a manner thatthe prongs of its fork rest on the plates 0 and O. The line-wire willthen be short-circuitcd through the plates 0 and O and the forkedswitch-lever h I am aware that a, carbon-holder has been operated by atrain of gearing in a pivoted frame, and therefore do not claim suchinvention.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1. In an electriclamp, the COHllJlllfllliOll, with a carbon-holderprovided with a rack, of a cog-wheel engaging with the rack, whichcogwheel is mounted on a swingingl'rame to which the magnet-cores forregulating the lamp are fastened, a ratchetwheel mounted in the swingingframe, a pendulum pivoted in the swinging frame and provided with apallet engaging withthe ratchet-wheel, which pendulum has its lower endforked, and of a screw projecting upward between the shanks ol" theforked end of the pendulum, which screw serves to regulate theoscillations of the pondulum, substantially as herein shown anddescribed.

2. In an electricl.amp,the combination,with a plate for receiving andholding the lower end of the globe, of two studs projecting up from thesaid plate and provided with heads at their upper ends, and of a plateheld in the lamp-frame and provided with two quadrant slots of such sizethat the heads on the studs cannot pass through them, the said slotsterminating at their diametriCally-opposite ends with enlargements ofsullicicnt size to admit the heads on the studs of the plate on whichthe globe is held to pass, substantially as here in shown and described.

3. In an electric lamp, the combination,wilh the plate I adapted toreceive and hold the bottom of the lamp-globe, of the headed studs IV,projecting upward from the plate I, the plate S, held on the bottom ofthe lamp-frame, and provided with two quadrantslots, t,. terminating attheir dianictrically-opposite ends in apertures 10 and at their otherends in countersunk recesses 11, substantially as here in shown anddescribed.

\Vitncsses:

Osolin F. GUNZ, (3. SEnewIoK.

EDWARD PIUKERING.

